Confused..Trans Coolers.. How is yours hooked up?

[olllie]

Hey guys, ill try to keep this question simple..

Just finished installing a B&M 2-4 servo (700r works well) but as i was changing out the fluid (dex not f type as some are using) I noticed the trans cooler setup the PO installed is after the in rad cooler...?? why would he do it this way?

thought the idea of external coolers was to keep coolant heat away from trans heat and if the rad failed, not fill your tanny with coolant..

Now its set up like this... pressure side to lower rad port, output of rad, to input of cooler, output of cooler back to trans, The 700 is rebuilt and I would say a trans shop installed the cooler.

Should i leave it or change it???

[INSIDIOUS '86]

That is correct. A trans is normally at 230 (optimal heat) and the engine should be at 195 or lower respectively not to mention it is plumbed on the cool side so i imagine its cooler than engine temp. The cooler in the radiator is also a heater since cold fluid in a trans is not good. So it will heat and cool the trans. This is how I would hook it up to provide better cooling on top of what the factory radiator does
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[olllie]

makes sence, the trans likes to operate at the same temp as the engine or just under.. i guess at low speed just running an external cooler with no fan may be an issue.

thanks for the reply.

[INSIDIOUS '86]

Basicly stick a red hot peice of steel in the air. Notice how it cools now stick it in a pot of water. Notice how it cools. Tell me which you would rather have.

The trans will always be hotter than the engine but can quickly overwhelm the radiator in performance conditions. Which is why a aux cooler is a good idea. If you launch at a drag strip as the airflow increases the cooling of the aux increases. But at a stop light it is not cooling way to much which is bad.

If anything just make sure the lines are quality and everything is put together professionally
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[INSIDIOUS '86]

Originally Posted by INSIDIOUS '86

Basicly stick a red hot peice of steel in the air. Notice how it cools now stick it in a pot of water. Notice how it cools. Tell me which you would rather have.

The trans will always be hotter than the engine but can quickly overwhelm the radiator in performance conditions. Which is why a aux cooler is a good idea. If you launch at a drag strip as the airflow increases the cooling of the aux increases. But at a stop light it is not cooling way to much which is bad.

If anything just make sure the lines are quality and everything is put together professionally
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Also. Run a transgo shift kit and a boost valve with high pressure springs in your pump if you want the trans to last through any abuse. I hope that b&m servo is greater than 20%
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[olllie]

not sure about the servo, its the only one b&m sells.. I thinks its 40 or 45% the truck had a shift kit done when the trans was built, no idea what type though. 1st to second shift is very firm, i found that i was getting some flare 2-3 and 3-4 the servo has made a big improvement from my drive today.

roads are super wet today so i need a dry day to go do some wot runs and see if shes still slipping.

[olllie]

http://bmracing.com/?wpsc-product=hi...vo-gm-th-700r4



Im thinking its just a vette servo in a fancy box. but $25 bux worth a shot.

[406 Q-ship]

You run the radiator trans cooler in series with a stand alone cooler to heat the fluid when it is cool and cool the fluid a bit before it runs through the aux cooler. Think of it this way, it takes a lot longer to heat the sticky transmission fluid to 200° than the water in the radiator. Now on cooling, If your radiator water is at 190° and the trans is 250° it will drop the temp a good 20° easy to only have to make the aux cooler drop 30° instead of 50°.

So running the radiator cooler is a pre-heater the pre-cooler. I always keep the rad cooler is line. Remember to run the top line of the radiator cooler to the added trans cooler and feed the cooler to the bottom, this is the make the system self bleeding removing any trapped air bubbles.

[INSIDIOUS '86]

Originally Posted by olllie

not sure about the servo, its the only one b&m sells.. I thinks its 40 or 45% the truck had a shift kit done when the trans was built, no idea what type though. 1st to second shift is very firm, i found that i was getting some flare 2-3 and 3-4 the servo has made a big improvement from my drive today.

roads are super wet today so i need a dry day to go do some wot runs and see if shes still slipping.

Fairbanks super servos and sonnax servos are out there as well
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[olllie]

Originally Posted by INSIDIOUS '86

Fairbanks super servos and sonnax servos are out there as well
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Ill look into those servo's im hoping the issue is solved with the b&m part, so far it feels much better.. I hate feeling the trans slip it makes me nervous.

dont know too much about 700r's very new to the gm product, but from what I've read on TV cables, that part seems ok, so a servo seemed like a good start to the flare fix.

Ill drop the pan next time i flush out the fluid and see if i can id the kit that was installed. Im lucky enough to have access to a Flush machine and free fluid

[oldmann1967]

I thought 190 was a high trans temp! At 230 you should change trans fluid like every 12000 miles!!

See chart.
http://www.digi-panel.com/trannyoil.htm
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[406 Q-ship]

Originally Posted by oldmann1967

I thought 190 was a high trans temp! At 230 you should change trans fluid like every 12000 miles!!

See chart.
http://www.digi-panel.com/trannyoil.htm
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I don't where that guys info came from but in a vehicle that gets used the trans fluid should be changed out once a year......or 10 to 12k miles. For a truck that tows or a vehicle with a lose stall you have to change fluid more often.

No way on Gods green earth am I going to run trans fluid for 50 to 100k.

[INSIDIOUS '86]

Originally Posted by olllie

Ill look into those servo's im hoping the issue is solved with the b&m part, so far it feels much better.. I hate feeling the trans slip it makes me nervous.

dont know too much about 700r's very new to the gm product, but from what I've read on TV cables, that part seems ok, so a servo seemed like a good start to the flare fix.

Ill drop the pan next time i flush out the fluid and see if i can id the kit that was installed. Im lucky enough to have access to a Flush machine and free fluid

http://www.transmissioncenter.net/

These guys can take care of you. Browse through and learn the good stuff
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[gchemist]

I would run mine at 175 degrees.

http://www.tciauto.com/tc/trans-life-expectancy

I run mine the same way radiator to cooler to tranny. I use AN fittings and steel braided hoses.

[olllie]

"I run mine the same way radiator to cooler to tranny. I use AN fittings and steel braided hoses. "

Wish i could afford nice lines and fittings, rubber line and doubled up clamps.. seems to hold up ok I guess a trans temp gauge would open my eyes up to actual operating temps.

Thanks for links guys!

[clinebarger]

190 to 200 is ideal temp for a transmission, Ive plumbed auxillary coolers both ways with NO difference in sump temps.